Arbor



FIG. 1 is a perspective illustration of an arbor according to the invention;

FIG. 2 is a top view of the arbor of FIG. 1.

FIG. 3 is a front view of the arbor of FIG. 1 (a back view is identical); and,

FIG. 4 is a left side elevation view of the arbor of FIG. 1 (a right side view is identical). 

I claim the ornamental design for an arbor, as shown and described. 